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Related Experiment Videos

Physiological control of blood pumps using intrinsic pump parameters: a computer simulation study.

Guruprasad A Giridharan1, Mikhail Skliar

  • 1Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA.

Artificial Organs
|April 29, 2006
PubMed
Summary

This study introduces a new method to estimate pressure differences in ventricular assist devices (VADs) using pump parameters, eliminating the need for unreliable implantable sensors. This innovation ensures reliable VAD control during various activities and conditions.

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Cardiovascular Engineering

Background:

  • Implantable sensors for rotary blood pumps are prone to long-term failure.
  • Current ventricular assist device (VAD) control often relies on unreliable pressure sensors.
  • Existing VAD control methods necessitate invasive pressure measurements.

Purpose of the Study:

  • To develop a model-based method for estimating DeltaP (pressure difference) without implantable sensors.
  • To create a VAD control system using only intrinsic pump parameters.
  • To eliminate the need for dedicated implantable pressure and flow sensors in VADs.

Main Methods:

  • Utilized an extended Kalman filter combined with a Golay-Savitzky filter for DeltaP estimation.
  • Developed a VAD controller based on the estimated DeltaP.

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  • Evaluated the system's performance through extensive computer simulations.

    • Main Results:

    • The proposed estimator-VAD controller system showed no significant performance degradation compared to direct DeltaP measurement.
    • The system effectively controlled the VAD across diverse physical activities and cardiac conditions.
    • Demonstrated that the VAD can function as both a pump and a differential pressure sensor.

    Conclusions:

    • A model-based DeltaP estimation method using intrinsic pump parameters is feasible and effective for VAD control.
    • This approach enhances VAD reliability by removing the need for implantable pressure sensors.
    • Further research is needed to assess the suitability of different VAD designs for this dual role.